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An ultrasound can show if they share a placenta, chorion, or amnion. However, if you have twins with seperate placentas or amniotic sacks they can still be identical. But if they share one then they are definately identical. Identical twins are random and occur in aproximately 1/800 births.

They can tell as early as about 10-12 weeks if they share the same placenta or amniotic sac. Then they are definately identical. But it is possible for them not to share, and still be identical. It depends on when the egg splits. I have identical girls and am 21 weeks, mine are mono/di (one placenta, two sacs). Good luck, I was dying to find out too, I just found out last week they were identical after thinking all this time they were fraternal!

You actually CAN'T tell for sure if they are fraternal or identical until they are born if they don't share a sac and have 2 placentas. If the egg splits early on (like in the fallopian tube) and then implants the babies can be identical (one egg that split) but have 2 placentas and be in 2 sacs. Just because there are 2 placentas doesn't mean they aren't identical. The doctors have no way of knowing for sure until the babies are born because they don't know if/when the egg split. Of course if there is one placenta then you know they are identical for sure.....unless it is 2 placentas that fused together, but the doctors should be able to tell that on the ultrasound.

I found out around 6-7 weeks that mine were identical because they shared the same sac. I'm not sure yet if they share a placenta but I bet they are. But, I agree with the other post, the bigger they get, the harder it will be to tell. Beth

So I am confused on how the dr. can tell. I am 4 months with twins in a couple of days. Last month I found out I was having twins and they had their own sacs and placentas. They didn't look to be identical. This month, they still have their own sac, but 1 placenta. And now they look to be identicals. I wonder if next month they will tell me something different. I didn't want identicals, I am so scared I will mix them up...lol. If ya got any words of wisdom, I sure would like to hear it.

Hi, I am 6 weeks pregnant with twins and just found this out during my first ultrasound yesterday! They were able to see that they each have their own placenta and do not share one, therefore, they are fraternal. You should have an ultrasound now before you get too far along when the uterus gets crowded making them unable to tell for sure. They should be able to tell you now for sure at 9 weeks.

They can make an educated guess. Certain factors will be able to make the determination easier. I am having identiccal twins. I am 9 weeks pregnant. My twins have two placentas and one sac. There is a wall deviding them wich is good. No poosibility of getting each other tangled in each others cords!! lol

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